High efficiency multicycle internal combustion engine with waste heat recovery
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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Nov 22, 2011
Grant Date -
Dec 3, 2009
app pub date -
Aug 12, 2009
filing date -
Mar 7, 2007
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A high efficiency combined cycle internal combustion and steam engine includes a cylinder and a piston with an internal combustion chamber outward of the piston, a fixed cylinder cap and a steam expansion chamber inside the piston. The cylinder cap can be heated to reduce condensation of steam entering from a steam generator fired by waste combustion heat. Following exhaust, residual steam can be recompressed prior to admitting the next charge of steam. A wrist pin connected to an inner end of the piston skirt inwardly of the cylinder cap is coupled to a connecting rod secured to a crankshaft. One valve or a pair of steam inlet valves are connected to communicate in series within the cylinder cap inside the piston. The steam mass admitted is regulated to reduce fuel consumption. Coolant can be superheated in the combustion exhaust manifold.
First Claim
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Family

- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
Patent Owner | Address | |
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THERMAL POWER RECOVERY LLC | 56 PINE STREET MAHTOMEDI MN 55115 |
International Classification(s)

- 2009 Application Filing Year
- F01K Class
- 203 Applications Filed
- 128 Patents Issued To-Date
- 63.06 % Issued To-Date
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
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Harmon,, Sr James V | Mahtomedi, US | 14 | 177 |
# of filed Patents : 14 Total Citations : 177 |
Cited Art Landscape
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Patent Citation Ranking
- 41 Citation Count
- F01K Class
- 96.88 % this patent is cited more than
- 14 Age
Forward Cite Landscape
- No Forward Cites to Display

Maintenance Fees
Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
Full Text

Legal Events
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Dec 25, 2023 | STCH | INFORMATION ON STATUS: PATENT DISCONTINUATION | free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
Nov 22, 2023 | FP | LAPSED DUE TO FAILURE TO PAY MAINTENANCE FEE | Effective Date: Nov 22, 2023 |
Jul 10, 2023 | FEPP | FEE PAYMENT PROCEDURE | free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY |
Sep 30, 2019 | MAFP | MAINTENANCE FEE PAYMENT | free format text: PAYMENT OF MAINTENANCE FEE, 8TH YR, SMALL ENTITY (ORIGINAL EVENT CODE: M2552); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY year of fee payment: 8 |
Sep 30, 2019 | FEPP | FEE PAYMENT PROCEDURE | free format text: 7.5 YR SURCHARGE - LATE PMT W/IN 6 MO, SMALL ENTITY (ORIGINAL EVENT CODE: M2555); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY |
Jul 15, 2019 | FEPP | FEE PAYMENT PROCEDURE | free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY |
Dec 03, 2014 | FPAY | FEE PAYMENT | year of fee payment: 4 |
Nov 22, 2011 | I | Issuance | |
Nov 02, 2011 | STCF | INFORMATION ON STATUS: PATENT GRANT | free format text: PATENTED CASE |
Jul 08, 2011 | AS | ASSIGNMENT | free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HARMON, JAMES V., SR.;REEL/FRAME:026563/0645 Owner name: THERMAL POWER RECOVERY LLC, MINNESOTA Effective Date: Jul 08, 2011 |
Dec 03, 2009 | P | Published | |
Aug 12, 2009 | F | Filing | |
Mar 07, 2007 | PD | Priority Date |

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